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#rb steve.smith robert.srinivasiah #jira UE-120364 [CL 17016770 by christopher fiala in ue5-main branch]
105 lines
3.5 KiB
C++
105 lines
3.5 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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/*=============================================================================
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ShadingRateAttachment.h: Variable rate shading attachment generation class
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definitions.
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=============================================================================*/
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#pragma once
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#include "CoreMinimal.h"
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#include "RHI.h"
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#include "RendererInterface.h"
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#include "RenderGraphDefinitions.h"
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/**
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* Explicit VRS source flags; each type of VRS image generated here will have it's own flag defined in this bitfield.
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* These flags can be used for any particular rendering path to exclude specific types of VRS generation; e.g.
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*
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*/
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enum class EVRSType : uint32
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{
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/** VRS Image to be applied during base pass. */
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FixedFoveation = 0x1,
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/** VRS Image to be applied during post-processing. */
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EyeTrackedFoveation = 0x2,
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// @todo: Add more types here as they're implemented.
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/** Mask of all available VRS source types. */
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All = FixedFoveation | EyeTrackedFoveation,
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/** Mask of XR fixed-foveation VRS gen only. */
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XRFoveation = FixedFoveation | EyeTrackedFoveation,
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None = 0x0,
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};
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ENUM_CLASS_FLAGS(EVRSType);
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enum class EVRSGenerationFlags : uint32;
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struct FVRSImageGenerationParameters;
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struct FDynamicVRSData
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{
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float VRSAmount = 1.0f;
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double SumBusyTime = 0.0;
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int NumFramesStored = 0;
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uint32 LastUpdateFrame = 0;
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};
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class FVariableRateShadingImageManager : public FRenderResource
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{
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public:
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FVariableRateShadingImageManager();
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virtual ~FVariableRateShadingImageManager();
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virtual void ReleaseDynamicRHI() override;
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/** Get the VRS image for the specified view setup, target size/configuration, and application flags.
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* If the VRS image does not exist, or is out of date, it will be rendered.
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* Static VRS images will be kept until until no longer referenced. */
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FRDGTextureRef GetVariableRateShadingImage(FRDGBuilder& GraphBuilder, const FSceneViewFamily& ViewFamily, const TArray<TRefCountPtr<IPooledRenderTarget>>* ExternalVRSSources, EVRSType VRSTypesToExclude = EVRSType::None);
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/** Special case (currently) for mobile devices; right now this will return either no image, or a static fixed-foveation shading rate image
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* provided by the stereo device runtime. */
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TRefCountPtr<IPooledRenderTarget> GetMobileVariableRateShadingImage(const FSceneViewFamily& ViewFamily);
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protected:
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TRefCountPtr<IPooledRenderTarget> RenderShadingRateImage(FRDGBuilder& GraphBuilder, uint64 Key, const FVRSImageGenerationParameters& VRSImageGenParamsIn, EVRSGenerationFlags GenFlags);
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uint64 CalculateVRSImageHash(const FVRSImageGenerationParameters& VRSImageGenParamsIn, EVRSGenerationFlags ViewFlags) const;
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void UpdateFixedFoveationParameters(FVRSImageGenerationParameters& VRSImageGenParamsInOut);
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void UpdateEyeTrackedFoveationParameters(FVRSImageGenerationParameters& VRSImageGenParamsInOut, const FSceneViewFamily& ViewFamily);
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float GetDynamicVRSAmount();
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/** Per frame tick/update. */
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void Tick();
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private:
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struct FActiveTarget
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{
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explicit FActiveTarget(const TRefCountPtr<IPooledRenderTarget>& TargetIn)
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: Target(TargetIn)
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, LastUsedFrame(GFrameNumber)
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{}
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FActiveTarget(FActiveTarget&& Other)
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: Target(MoveTemp(Other.Target))
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, LastUsedFrame(Other.LastUsedFrame)
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{}
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TRefCountPtr<IPooledRenderTarget> Target;
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uint64 LastUsedFrame = 0;
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};
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TMap<uint64, FActiveTarget> ActiveVRSImages;
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TRefCountPtr<IPooledRenderTarget> MobileHMDFixedFoveationOverrideImage;
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uint64 LastFrameTick;
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FDynamicVRSData DynamicVRSData;
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};
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RENDERER_API extern TGlobalResource<FVariableRateShadingImageManager> GVRSImageManager;
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